Freeman's
Guide To Core Vents
Part 1 of 2: Core Vent Overview
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directly to Part 2: Freeman's Line of Core Vents
Core
box air release vents enable "core blowing" equipment
to effectively fill the core box with sand, and allow for
the safe escape of gases, heat, and air during core manufacturing.
Freeman offers a large selection of vents in brass, steel,
and aluminum for a wide range of applications.
When
selecting the proper core vent for an application, please
follow these guidelines...
#1 - Type of Metal:
Three basic metals are offered: Brass, Steel, and Aluminum.
- Brass
is a softer metal which makes it easier to contour, remove
from the core box, and clean.
- Steel
vents offer greater wear resistance, can withstand higher
temperatures, and match metal with steel core boxes for
uniform heating and cooling.
- Aluminum
vents are popular for Styrofoam molding applications and
offer many of the same advantages as the steel vents.
#2
- Style of Vent:
Slotted
vents and screen vents are the most popular types of vents.
Slotted
|
Screen
Mesh
|
In
addition to slotted and screen mesh vents, Freeman offers
three specialty vents which better meet specific needs in
core construction.
- Nylon
Vents , which offer durability with a non-stick
surface
- Perforated
Vents, which offer durability
and effective venting for coarser sands
- Porous
Metal Vents, which offer
venting for very fine sands
- Shalco
Super Vents,
which offer a 43% opening rate (versus 13% for slotted and
30% for mesh)
#3
- Slot Width/Screen Mesh:
The
width of the slot or the size of the mesh required is determined
by the size of the sand (mesh) being used in the construction
of your core. The width/mesh of your vent must not be greater
then the sand mesh in order to hold the sand in the core box
while permitting the air to escape.
#4
- Dimensions:
- Depth
– is based on the depth of the shoulder created by
the step drill (insert drill).
- Head
Thickness – affects the ability to contour
the vent to the tool surface. The thicker the head the more
contouring can be done and the thinner the head the less
likely it is to clog with binders.
- Diameter
– is determined by the size of the area requiring
venting and the number of vents preferred in the particular
location on the core box.
Continue
to Part 2 of 2: Freeman's Line of Core Vents
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